sorting is easier since you mostly pull packages, and unloading is supposed to be harder because you have to use alot of legs/back to pick stuff up.
i prefer the unload since i got used to it over the years and sorting is boring to me now unless you have someone that can hold a conversation and not just
put his headphones on assuming you get a partner. the raise is worth it if your building offers it as for the actual work, just go with what you think is safe
and assume you wont get help incase of a jam.